Three-dimensional graphene-POSS nanocomposite modified polyimide and preparation method thereof

Abstract

The invention discloses a preparation method of three-dimensional graphene-POSS (Polyhedral Oligomeric Silsesquioxane) nanocomposite modified polyimide, which is used for preparing nanoscale three-dimensional graphene-POSS with a three-dimensional structure by adopting a thermal chemical vapor deposition technology and a high-temperature heat treatment technology, and solves the problem that two-dimensional materials such as graphene, graphene oxide and the like are easy to agglomerate. The large-proportion three-dimensional graphene-POSS content is realized to be used for modifying polyimide; through a three-dimensional graphene-POSS nano modification technology, the problems that existing polyimide is poor in atomic oxygen resistance and insufficient in space environment adaptability are solved, the surface of the polyimide is free of defects and holes, the polyimide has excellent atomic oxygen resistance on the basis of good mechanical properties and electrical properties, and the atomic oxygen erosion rate is superior to 0.8 * 10 <-24 > cm < 3 >/atom.

Description

technical field [0001] The invention relates to the technical field of thermal control materials, in particular to a polyimide modified by a three-dimensional graphene-POSS nanocomposite material and a preparation method thereof. Background technique [0002] Polyimide has multiple outstanding advantages such as medium absorption-radiation ratio (αs / εh), anti-charged particle radiation, anti-ultraviolet radiation, resistance to cold and heat cycles, less vacuum volatiles, and easy to use. It is often used as a multilayer on the outer surface of spacecraft. The mask of the thermal insulation component is an important thermal control material of the spacecraft, and is widely used as the flexible substrate of the solar cell array of the spacecraft, the multi-layer thermal insulation blanket and the insulation protection layer of the circuit system. [0003] Space stations, small satellites and other spacecraft work in low earth orbit for a long time. The low earth orbit environ...

AI Technical Summary

Problems solved by technology

[0004] Atomic oxygen in low earth orbit has high flux and strong oxidizing properties, which will quickly erode polyimide, the main thermal control material on the surface of the spacecraft, and degrade its important properties such as optics, electricity, and mechanics, which will cause the spacecraft to work Decreased efficiency, shortened service life, failure of system target design

[0005] Chinese patent CN 112795036 A discloses a method for preparing a graphene-modified polyimide composite film. The film is introduced into the polyimide matrix by modified graphene oxide, and the graphene oxide is modified by polyisocyanate to increase the layer thickness. The spacing improves the dispersion of graphene oxide in the polyimide matrix, however, there are still weaknesses in the ability to resist atomic oxygen and the lack of adaptability to the space environment.

Images